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Difficulty: MediumCoding and Decoding

In a certain coding language, words are translated by shifting each letter forward in the English alphabet based on its positional index within the word. The first letter is shifted by one position, the second letter by two positions, the third letter by three positions, and so on. Based on this translation rule, match the given words on the left with their correctly coded equivalents on the right.

  • STARTVDV
  • WINDXKQH
  • LOCKMQFO
  • PUMPQWPT

Answer

STAR matches with TVDV, WIND matches with XKQH, LOCK matches with MQFO, and PUMP matches with QWPT.
By successfully applying a variable forward shift (+1 for the first letter, +2 for the second, +3 for the third, and +4 for the fourth) to each original word, we generate their exact coded counterparts.

Step-by-Step Solution

1
Identify the core logic for the encryption method.
Each letter is shifted forward by its index position in the word (+1, +2, +3, +4).
This establishes the rule needed to decode or encode all the given words.
2
Apply the progressive shift to the word 'STAR'.
S(+1) = T, T(+2) = V, A(+3) = D, R(+4) = V. The encoded word is TVDV.
To accurately pair the first item.
3
Apply the progressive shift to the word 'WIND'.
W(+1) = X, I(+2) = K, N(+3) = Q, D(+4) = H. The encoded word is XKQH.
To accurately pair the second item.
4
Apply the progressive shift to the word 'LOCK'.
L(+1) = M, O(+2) = Q, C(+3) = F, K(+4) = O. The encoded word is MQFO.
To accurately pair the third item.
5
Apply the progressive shift to the word 'PUMP'.
P(+1) = Q, U(+2) = W, M(+3) = P, P(+4) = T. The encoded word is QWPT.
To accurately pair the final item.

Key Concept

Positional Letter Shifting
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Topics

Coding and Decoding

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